The Most Effective Way to Kill a Tree Is to Remove

Multiple Choice

The most effective way to kill a tree is to remove a ring of bark from the circumference.Why does the tree die?

A) No water can be transported from the roots to the leaves.
B) No water can be transported from the leaves to the roots.
C) No sugars can be transported from the leaves to the roots.
D) Both water and sugars are prevented from being transported.